I found the following in a review by Philip D. Straffin (College Mathematics Journal, May 2003) of Noam Elkies and Richard Stanley's "The Mathematical Knight," The Mathematical Intelligencer 25:1 (Winter 2003) 22-34: ******** "...there are also discussions and problems for the reader (with answers at the end) that lead in less familiar directions. Here are some of my favorites: 1) Determine the knight distance from (0,0) to (m,n) on an infinite board 2) If you plot the 4! shortest knight paths from (0,0) to (6,0) you get an elegant projection of the edges of the 4-dimensional hypercube. Explain..." ***** It's hard not to pick up pencil and pad when you read stuff like that! Thane Plambeck 650 321 4884 office 650 323 4928 fax http://www.qxmail.com/home.htm